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+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+/*! \file silk_Inlines.h
+ * \brief silk_Inlines.h defines OPUS_INLINE signal processing functions.
+ */
+
+#ifndef SILK_FIX_INLINES_H
+#define SILK_FIX_INLINES_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* count leading zeros of opus_int64 */
+static OPUS_INLINE opus_int32 silk_CLZ64( opus_int64 in )
+{
+ opus_int32 in_upper;
+
+ in_upper = (opus_int32)silk_RSHIFT64(in, 32);
+ if (in_upper == 0) {
+ /* Search in the lower 32 bits */
+ return 32 + silk_CLZ32( (opus_int32) in );
+ } else {
+ /* Search in the upper 32 bits */
+ return silk_CLZ32( in_upper );
+ }
+}
+
+/* get number of leading zeros and fractional part (the bits right after the leading one */
+static OPUS_INLINE void silk_CLZ_FRAC(
+ opus_int32 in, /* I input */
+ opus_int32 *lz, /* O number of leading zeros */
+ opus_int32 *frac_Q7 /* O the 7 bits right after the leading one */
+)
+{
+ opus_int32 lzeros = silk_CLZ32(in);
+
+ * lz = lzeros;
+ * frac_Q7 = silk_ROR32(in, 24 - lzeros) & 0x7f;
+}
+
+/* Approximation of square root */
+/* Accuracy: < +/- 10% for output values > 15 */
+/* < +/- 2.5% for output values > 120 */
+static OPUS_INLINE opus_int32 silk_SQRT_APPROX( opus_int32 x )
+{
+ opus_int32 y, lz, frac_Q7;
+
+ if( x <= 0 ) {
+ return 0;
+ }
+
+ silk_CLZ_FRAC(x, &lz, &frac_Q7);
+
+ if( lz & 1 ) {
+ y = 32768;
+ } else {
+ y = 46214; /* 46214 = sqrt(2) * 32768 */
+ }
+
+ /* get scaling right */
+ y >>= silk_RSHIFT(lz, 1);
+
+ /* increment using fractional part of input */
+ y = silk_SMLAWB(y, y, silk_SMULBB(213, frac_Q7));
+
+ return y;
+}
+
+/* Divide two int32 values and return result as int32 in a given Q-domain */
+static OPUS_INLINE opus_int32 silk_DIV32_varQ( /* O returns a good approximation of "(a32 << Qres) / b32" */
+ const opus_int32 a32, /* I numerator (Q0) */
+ const opus_int32 b32, /* I denominator (Q0) */
+ const opus_int Qres /* I Q-domain of result (>= 0) */
+)
+{
+ opus_int a_headrm, b_headrm, lshift;
+ opus_int32 b32_inv, a32_nrm, b32_nrm, result;
+
+ silk_assert( b32 != 0 );
+ silk_assert( Qres >= 0 );
+
+ /* Compute number of bits head room and normalize inputs */
+ a_headrm = silk_CLZ32( silk_abs(a32) ) - 1;
+ a32_nrm = silk_LSHIFT(a32, a_headrm); /* Q: a_headrm */
+ b_headrm = silk_CLZ32( silk_abs(b32) ) - 1;
+ b32_nrm = silk_LSHIFT(b32, b_headrm); /* Q: b_headrm */
+
+ /* Inverse of b32, with 14 bits of precision */
+ b32_inv = silk_DIV32_16( silk_int32_MAX >> 2, silk_RSHIFT(b32_nrm, 16) ); /* Q: 29 + 16 - b_headrm */
+
+ /* First approximation */
+ result = silk_SMULWB(a32_nrm, b32_inv); /* Q: 29 + a_headrm - b_headrm */
+
+ /* Compute residual by subtracting product of denominator and first approximation */
+ /* It's OK to overflow because the final value of a32_nrm should always be small */
+ a32_nrm = silk_SUB32_ovflw(a32_nrm, silk_LSHIFT_ovflw( silk_SMMUL(b32_nrm, result), 3 )); /* Q: a_headrm */
+
+ /* Refinement */
+ result = silk_SMLAWB(result, a32_nrm, b32_inv); /* Q: 29 + a_headrm - b_headrm */
+
+ /* Convert to Qres domain */
+ lshift = 29 + a_headrm - b_headrm - Qres;
+ if( lshift < 0 ) {
+ return silk_LSHIFT_SAT32(result, -lshift);
+ } else {
+ if( lshift < 32){
+ return silk_RSHIFT(result, lshift);
+ } else {
+ /* Avoid undefined result */
+ return 0;
+ }
+ }
+}
+
+/* Invert int32 value and return result as int32 in a given Q-domain */
+static OPUS_INLINE opus_int32 silk_INVERSE32_varQ( /* O returns a good approximation of "(1 << Qres) / b32" */
+ const opus_int32 b32, /* I denominator (Q0) */
+ const opus_int Qres /* I Q-domain of result (> 0) */
+)
+{
+ opus_int b_headrm, lshift;
+ opus_int32 b32_inv, b32_nrm, err_Q32, result;
+
+ silk_assert( b32 != 0 );
+ silk_assert( Qres > 0 );
+
+ /* Compute number of bits head room and normalize input */
+ b_headrm = silk_CLZ32( silk_abs(b32) ) - 1;
+ b32_nrm = silk_LSHIFT(b32, b_headrm); /* Q: b_headrm */
+
+ /* Inverse of b32, with 14 bits of precision */
+ b32_inv = silk_DIV32_16( silk_int32_MAX >> 2, silk_RSHIFT(b32_nrm, 16) ); /* Q: 29 + 16 - b_headrm */
+
+ /* First approximation */
+ result = silk_LSHIFT(b32_inv, 16); /* Q: 61 - b_headrm */
+
+ /* Compute residual by subtracting product of denominator and first approximation from one */
+ err_Q32 = silk_LSHIFT( ((opus_int32)1<<29) - silk_SMULWB(b32_nrm, b32_inv), 3 ); /* Q32 */
+
+ /* Refinement */
+ result = silk_SMLAWW(result, err_Q32, b32_inv); /* Q: 61 - b_headrm */
+
+ /* Convert to Qres domain */
+ lshift = 61 - b_headrm - Qres;
+ if( lshift <= 0 ) {
+ return silk_LSHIFT_SAT32(result, -lshift);
+ } else {
+ if( lshift < 32){
+ return silk_RSHIFT(result, lshift);
+ }else{
+ /* Avoid undefined result */
+ return 0;
+ }
+ }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SILK_FIX_INLINES_H */